package com.itheima.reggie.service.iml;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类 先判断分类是否关联菜品和套餐
     *
     * @param id
     */
    @Override
    public void delete(Long id) {
        //添加查询条件，根据分类id进行查询菜品数据
        LambdaQueryWrapper<Dish> dishLqw = Wrappers.<Dish>lambdaQuery();
        dishLqw.eq(Dish::getCategoryId, id);
        int dishCount = dishService.count(dishLqw);
        //如果已经关联，抛出一个业务异常
        if (dishCount > 0) {
            throw new CustomException("当前分类有关联菜品,无法删除");
        }

        //添加查询条件，根据分类id进行查询套餐数据
        //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLqw = Wrappers.<Setmeal>lambdaQuery();
        setmealLqw.eq(Setmeal::getCategoryId, id);
        int setmealCount = setmealService.count(setmealLqw);
        if (setmealCount > 0) {
            throw new CustomException("当前分类有关联套餐,无法删除");
        }
        //正常删除分类
        super.removeById(id);
    }
}
